I have seen this non-booting behavior with USB3 drives connected through a
Thunderbolt connection to a Mac that does not support USB3 natively. They
can be mounted through TB, but only after the machine has booted, making it
impossible to boot off those drives.
I suspect that (making the huge assu
Well I got the enclosure, but things didn’t go as planned. I got a deal on an
enclosure that had once been an Iomega Mac Companion. I installed the SSD,
hooked the enclosure up to my Firewire 800 port and it showed up on the
desktop. I installed El Capitan and rebooted, but when the Mac rebooted
